CN216596001U - Digital quantity input circuit and device - Google Patents
Digital quantity input circuit and device Download PDFInfo
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- CN216596001U CN216596001U CN202123177836.3U CN202123177836U CN216596001U CN 216596001 U CN216596001 U CN 216596001U CN 202123177836 U CN202123177836 U CN 202123177836U CN 216596001 U CN216596001 U CN 216596001U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses a digital quantity input circuit and a device, belonging to the technical field of PLC, wherein the digital quantity input circuit comprises a triode T1, a triode T2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4; resistance R1's one end with connector J1 is connected, the other end respectively with resistance R2's one end with triode T2's collecting electrode is connected, resistance R2's the other end respectively with triode T1's collecting electrode with triode T2's base is connected, triode T2's projecting pole respectively with triode T1's base with resistance R3's one end is connected, triode T1's projecting pole respectively with resistance R3's the other end resistance R4 with the controller is connected. The utility model solves the problem that the digital quantity input circuit in the prior art has larger heat loss and influences the PLC design, and achieves the effects of providing current-limiting protection and reducing the heat loss of the interface.
Description
Technical Field
The utility model relates to the technical field of PLC (programmable logic controller), in particular to a digital quantity input circuit and a digital quantity input device.
Background
Digital Input (DI) is a common basic circuit in PLC (Programmable Logic Controller) and is also a very critical circuit. In the prior art, a DI circuit is usually designed by using an opto-coupler or an integrated circuit chip, but these solutions have some problems. The heat loss at the PLC input port is often determined by the load resistance in the DI circuit, and in an actual PLC design, due to the deviation of the input range, the heat loss of the load resistance in the DI circuit may be relatively large, that is, the heat loss of the interface at the PLC input port is increased, which may have a large impact on the design of the PLC, especially in a multi-point PLC design with multiple inputs.
SUMMERY OF THE UTILITY MODEL
The main purposes of the utility model are as follows: the utility model provides a digital quantity input circuit and device, aims at solving the technical problem that the digital quantity input circuit has the heat loss great among the prior art, influences the PLC design.
In order to achieve the purpose, the utility model adopts the following technical scheme:
in a first aspect, the present invention provides a digital quantity input circuit, an input terminal of the circuit is connected to a connector J1, and an output terminal of the circuit is connected to a controller U4, the circuit includes:
the circuit comprises a triode T1, a triode T2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;
one end of the resistor R1 is connected to the connector J1, the other end of the resistor R1 is connected to one end of the resistor R2 and the collector of the transistor T2, the other end of the resistor R2 is connected to the collector of the transistor T1 and the base of the transistor T2, the emitter of the transistor T2 is connected to the base of the transistor T1 and one end of the resistor R3, and the emitter of the transistor T1 is connected to the other end of the resistor R3, the resistor R4 and the controller U4;
the voltage output by the connector J1 reaches the base of the triode T2 through the resistor R1 and the resistor R2, the triode T2 is turned on, the voltage passing through the resistor R1 reaches the collector of the triode T2 and reaches the resistor R3 through the emitter of the triode T2, the resistor R3 limits the current, the voltage reaches the base of the triode T1, when the voltage is greater than a preset threshold, the triode T1 is turned on, the triode T2 is turned off, the voltage passing through the resistor R2 reaches the collector of the triode T1 and is output through the emitter of the triode T1, and the voltage output by the triode T1 is divided by the resistor R4 and then is input to the controller U4.
Optionally, in the digital input circuit, the circuit further includes:
a Light Emitting Diode (LED) 1 connected between an emitter of the transistor T2 and one end of the resistor R3;
the light emitting diode LED1 is used to indicate the operating status of the circuit.
Optionally, in the digital input circuit, the circuit further includes:
a diode D1 connected between the other end of the resistor R1 and the collector of the transistor T2;
the diode D1 is used to control the voltage direction or provide regulated protection to the LED 1.
Optionally, in the digital input circuit, the circuit further includes:
a diode array D2 connected between the emitter of the transistor T1 and the common junction of the resistor R4 and the controller U4;
the diode array D2 is used to provide electrostatic discharge protection to the circuit.
Optionally, in the digital input circuit, the circuit further includes:
a trigger inverter U1, a shift register U2 and a digital isolator U3 which are connected between the emitter of the triode T1 and the controller U4 and are connected in sequence;
the trigger inverter U1 is used for shaping the voltage output by the triode T1 and outputting a digital input signal;
the shift register U2 is used for converting one or more paths of received digital input signals and outputting synchronous serial signals;
the digital isolator U3 is used for isolating the circuit from the controller U4 and inputting the synchronous serial signal to the controller U4.
Optionally, in the digital input circuit, the resistance of the resistor R2 is greater than the resistances of the resistor R1 and the resistor R4.
Optionally, in the digital input circuit, the resistance ranges of the resistor R1 and the resistor R4 are greater than 0 Ω;
the resistance range of the resistor R2 is at least 100 times larger than that of the resistor R1, at least 100 times larger than that of the resistor R4 and larger than 100 omega.
Optionally, in the digital input circuit, the preset threshold is in a range from 0.5V to 0.7V.
Optionally, in the above digital input circuit, the controller U4 is a programmable logic controller.
In a second aspect, the present invention also provides a digital quantity input device, which includes the digital quantity input circuit as described above.
One or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:
according to the digital quantity input circuit and the digital quantity input device, the purpose of inputting a digital quantity signal to the controller U4 is achieved by adopting the digital quantity input circuit consisting of the conventional devices such as the triode, the resistor and the like, no special device is needed, the circuit cost and the space can be saved, and the volume is reduced; the voltage output by the connector J1 reaches the triode T2 through the resistor R1 and the resistor R2, so that the triode T2 is conducted, the voltage passing through the resistor R1 reaches the resistor R3 through the triode T2, the resistor R3 limits the current, the voltage reaches the triode T1, when the voltage is greater than a preset threshold value, the triode T1 is conducted, the triode T2 is turned off, the voltage passing through the resistor R2 is output through the triode T1, and the output voltage is divided by the resistor R4 and then is input to the controller U4; when the input voltage is too high, the resistor R2 can share a large amount of voltage, which does not affect the normal operation of the main circuit itself, and the voltage of the resistors R1 and R4 is more stable, resulting in less heat loss. Therefore, compared with the prior art, the utility model can achieve the effects of providing current-limiting protection and reducing the heat loss of the interface of the controller, has small volume and low cost, and can be suitable for the design occasion of a plurality of PLC.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The drawings in the following description are only some embodiments of the utility model and other drawings may be derived from the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a digital input circuit using a photocoupler in the prior art;
FIG. 2 is a schematic diagram of a digital input circuit using an integrated circuit chip according to the prior art;
fig. 3 is a schematic diagram of the digital input circuit of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that, in the present invention, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, such that an apparatus or system including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such apparatus or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a device or system that comprises the element. In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internally or in interactive relation.
In the present invention, suffixes such as "module", "part", or "unit" used to represent elements are used only for facilitating the description of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In addition, the technical solutions of the respective embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Digital Input (DI) is a common basic circuit in PLC (Programmable Logic Controller) and is also a very critical circuit. In the prior art, a photo coupler or an Integrated Circuit IC (Integrated Circuit) is usually used to design a DI Circuit, and analysis of the prior art shows that these schemes have some problems:
fig. 1 shows a digital input circuit designed by a photoelectric coupler in the prior art, and when the circuit is applied to a situation with a large input amount, a large number of photoelectric couplers are needed, and the use of a large number of photoelectric couplers can increase the volume of the PLC; moreover, because the conduction rate of the photoelectric coupler is generally low, when the circuit is applied to a high-speed occasion, the high-speed photoelectric coupler needs to be adopted, but the high-speed photoelectric coupler has high cost. Therefore, the DI circuit using the photo coupler has problems of high cost and an increase in volume of the PLC.
Fig. 2 shows a digital input circuit designed by using an integrated circuit chip in the prior art, where the cost of the integrated circuit IC is high and the PLC cost is also increased when both the conduction rate and the volume are satisfied. Therefore, the DI circuit using the integrated circuit chip also has a problem of high cost.
Meanwhile, the DI circuits of the above two schemes have a problem that the heat loss at the input port of the PLC is often determined by the load resistance in the DI circuit, and in the actual PLC design, due to the deviation of the input range, the heat loss of the load resistance in the DI circuit may be relatively large, that is, the heat loss of the interface at the input port of the PLC is increased, which may cause a large impact on the design of the PLC, especially in the multi-point PLC design with multiple inputs.
In view of the technical problems of large heat loss and influence on the design of the PLC in the digital input circuit in the prior art, the present invention provides a digital input circuit and a digital input device, and the specific embodiments and implementation manners are as follows:
example one
Referring to fig. 3, the present embodiment provides a digital input circuit, and more particularly, a DI circuit with a current limiting function. The input end of the digital quantity input circuit is connected with a connector J1, and the output end of the digital quantity input circuit is connected with a controller U4, as shown in a circuit schematic diagram of FIG. 3, the circuit comprises:
the circuit comprises a triode T1, a triode T2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;
one end of the resistor R1 is connected to the connector J1, the other end of the resistor R1 is connected to one end of the resistor R2 and the collector of the transistor T2, the other end of the resistor R2 is connected to the collector of the transistor T1 and the base of the transistor T2, the emitter of the transistor T2 is connected to the base of the transistor T1 and one end of the resistor R3, and the emitter of the transistor T1 is connected to the other end of the resistor R3, the resistor R4 and the controller U4; an emitter of the triode T1 is specifically connected with one end of the resistor R4, and the other end of the resistor R4 is grounded after being connected with a ground terminal VSS of the connector J1;
the voltage output by the connector J1 reaches the base of the triode T2 through the resistor R1 and the resistor R2, the triode T2 is turned on, the voltage passing through the resistor R1 reaches the collector of the triode T2 and reaches the resistor R3 through the emitter of the triode T2, the resistor R3 limits the current, the voltage reaches the base of the triode T1, when the voltage is greater than a preset threshold, the triode T1 is turned on, the triode T2 is turned off, the voltage passing through the resistor R2 reaches the collector of the triode T1 and is output through the emitter of the triode T1, and the voltage output by the triode T1 is divided by the resistor R4 and then is input to the controller U4.
Specifically, the resistors R1 and R4 are DI load resistors, the resistor R3 is a current limiting resistor, and the current limiting resistor R3 can be used to limit the voltage of the branch to prevent the component connected in series from being burned out due to excessive voltage, and meanwhile, the current limiting resistor can also perform a voltage dividing function.
The resistor R2 is a voltage dividing resistor, specifically a resistor with a large resistance value, and is used for sharing the port voltage, wherein the resistance value of the resistor R2 is larger than the resistance values of the resistor R1 and the resistor R4.
Preferably, the resistance ranges of the resistor R1 and the resistor R4 are greater than 0 Ω.
That is, the resistor R1 and the resistor R4 may be any non-zero resistors, and values of the resistor R1 and the resistor R4 may be different, and specific values may be values of common resistors, for example, 10 Ω, 33 Ω, 100 Ω, 332 Ω, 1K Ω, 1.87K Ω, 2.2K Ω, 3.32K Ω, and the like.
The resistance range of the resistor R2 is at least 100 times larger than that of the resistor R1, at least 100 times larger than that of the resistor R4 and larger than 100 omega.
That is, the resistor R2 is a resistor satisfying the above three values, and the specific value may be a value of a common resistor. For example, when the resistor R1 is 2.2K Ω and the resistor R4 is 1.87K Ω, the value of the resistor R2 should satisfy three conditions of being greater than 220K Ω, being greater than 187K Ω and being greater than 100 Ω at the same time, for example, the value of the resistor R2 may be 240K Ω, 270K Ω, 300K Ω, 332K Ω, and so on.
Specifically, the Controller U4 adopts a Programmable Logic Controller (PLC), and has the characteristics of reliable operation, programmability, and the like. In this embodiment, a CPLD (Complex Programmable Logic Device) is specifically adopted, which has the advantages of high density, high speed and low power consumption, and can increase the response rate.
Optionally, the circuit further comprises:
a Light Emitting Diode (LED) 1 connected between an emitter of the transistor T2 and one end of the resistor R3;
the light emitting diode LED1 is used to indicate the operating status of the circuit.
Optionally, the circuit further comprises:
a diode D1 connected between the other end of the resistor R1 and the collector of the transistor T2;
the diode D1 is used to control the voltage direction or provide regulated protection to the LED 1.
Specifically, when the transistor T2 is turned on, the diode D1 can control the direction of the voltage flowing through it, preventing damage to the circuit due to reverse connection; when the circuit is connected with a light emitting diode LED1 and the triode T2 is conducted, the diode D1 can control voltage, so that the light emitting diode LED1 is not broken down due to too large voltage, and voltage stabilization protection is provided for the light emitting diode LED 1.
Optionally, the circuit further comprises:
a diode array D2 connected between the emitter of the transistor T1 and the common junction of the resistor R4 and the controller U4;
the diode array D2 is used to provide electrostatic discharge (ESD) protection to the circuit.
Optionally, the circuit further comprises:
a trigger inverter U1, a shift register U2 and a digital isolator U3 which are connected between the emitter of the triode T1 and the controller U4 and are connected in sequence;
the trigger inverter U1 is used for shaping the voltage output by the triode T1 and outputting a Digital Input (DI) signal;
the shift register U2 is configured to convert one or more received Digital Input (DI) signals and output a synchronous Serial Interface (SPI) signal;
the digital isolator U3 is used for isolating the digital input circuit from the controller U4 and inputting the synchronous serial signal to the controller U4.
The working process of the embodiment is as follows:
the connector J1 receives switching value signals input by other devices, and outputs the switching value signals to the digital value input circuit through the output port of the connector J1; when the digital input circuit is in operation, the connector J1 outputs a voltage of 24V or 36V, which is passed through the resistor R1 and the resistor R2 to the base of the transistor T2, where V is set to be equal to Vb2>Ve2The transistor T2 is turned on;
after the triode T2 is turned on, the voltage passing through the resistor R1 reaches the collector of the triode T2 through the diode D1, and is output through the emitter of the triode T2 to drive the light-emitting diode LED1 to light, the voltage reaches the resistor R3 again, a certain voltage drop exists on the resistor R3 to limit the current, at this time, the voltage reaches the base of the triode T1, and when the voltage is greater than a preset threshold, for example, greater than 0.5V to 0.7V, the tube drop V of the triode T1 is larger than the preset threshold, and the voltage is reduced by Vb1e1When the voltage drop is lower than the conduction voltage drop, the triode T1 is conducted, and the triode T2 is turned off;
at this time, the circuit loop only has a main loop of the triode T1, the voltage passing through the resistor R2 reaches the collector of the triode T1 and is output through the emitter of the triode T1, and the voltage output by the triode T1 passes through the diode array D2, is divided by the resistor R4, and is input to the controller U4; in the process, if the transistor T1 has a tube voltage drop Vb1e1When the voltage is lower than the conduction voltage drop, the triode T1 is continuously conducted, and the circuit is continuously in a working state; as the voltage increases, the transistor T1 has a voltage drop Vb1e1Gradually increase, correspondingly, Ib1Gradually increasing, according to the characteristics of the triode, Ic1Will also gradually increase; since the transistor T2 is at this timeb2Almost negligible, therefore, the current of resistor R2 is equal to Ic1Basically the same, since the resistance value of the resistor R2 is larger, thisWhen the voltage of the circuit rises, the higher voltage can be borne by the resistor R2, so that current-limiting protection is provided, and the voltage and the current borne by the resistor R1 and the resistor R4 of the main loop are basically stabilized at a lower level.
In this embodiment, the output voltage is further shaped by the trigger inverter U1 to output a digital input signal, the digital input signal is input to the shift register U2, the shift register U2 converts the received one or more DI signals to output a group of SPI signals, and the digital isolator U3 isolates the digital input circuit from the controller U4 and inputs a synchronous serial signal to the controller U4.
In this embodiment, the connection of the devices is performed according to the schematic circuit diagram shown in fig. 3, and based on the operation principle, a specific test is performed:
in this embodiment, the resistance R1 is 2.2K Ω, the resistance R2 is 332K Ω, the resistance R3 is 178 Ω, and the resistance R4 is 1.87K Ω;
when the voltage input to the circuit by the connector J1 is 24V, the voltage on the resistor R1 is measured to be 6.4V, the voltage on the resistor R2 is measured to be 8.2V, and the voltage on the resistor R3 is measured to be 5.3V;
when the voltage input to the circuit by the connector J1 is 36V, the voltage on the resistor R1 is measured to be 7.1V, the voltage on the resistor R2 is measured to be 42.6V, and the voltage on the resistor R3 is measured to be 5.8V;
in practical applications, it is generally required that the level inputted to the controller U4 is in the range of 2V to 6V, that is, in this embodiment, when the voltage across the resistor R4 is below 5V, the circuit stops inputting signals to the controller, that is, stops operating, and when the voltage is above 15V, the circuit starts inputting signals to the controller, that is, starts operating. In view of the above requirements, it is found that when the voltage input to the circuit is 10V, the voltage across the resistor R4 meets the requirement of starting operation, and thus, the circuit design of the present embodiment can meet the actual requirement.
Meanwhile, as can be seen from the above measured values, the voltage input to the circuit increases, the influence on the load resistors R1 and R4 is small, the heat loss on the two load resistors is also relatively maintained at a low level, the increased voltage is mainly shared by the resistor R2, and since the resistance of the resistor R2 is large enough, the heat loss of the resistor R2 is limited, and the heat loss of the controller interface is not increased, in this case, a good current-limiting protection effect is performed on the circuit itself.
The digital input circuit of the embodiment adopts the triodes, the resistors and other conventional devices to form the digital input circuit, so that the purpose of inputting digital signals to the controller U4 is realized, the current value is dynamically regulated through the triodes, special devices are not needed, the circuit cost and space can be saved, and the volume is reduced;
the method can be directly realized through hardware, does not need to be processed through software, and has high reaction speed; the voltage output by the connector J1 reaches the triode T2 through the resistor R1 and the resistor R2, so that the triode T2 is conducted, the voltage passing through the resistor R1 reaches the resistor R3 through the triode T2, the resistor R3 limits the current, the voltage reaches the triode T1, when the voltage is greater than a preset threshold value, the triode T1 is conducted, the triode T2 is turned off, the voltage passing through the resistor R2 is output through the triode T1, and the output voltage is divided by the resistor R4 and then is input to the controller U4; when the input voltage is too high, the resistor R2 can share a large amount of voltage, which does not affect the normal operation of the main circuit itself, and the voltage of the resistors R1 and R4 is more stable, resulting in less heat loss.
Therefore, compared with the prior art, the utility model can achieve the effects of providing current-limiting protection and reducing the heat loss of the interface of the controller, has small volume and low cost, and can be suitable for the design occasion of a multi-point PLC.
Example two
The present embodiment proposes a digital quantity input device for inputting a digital quantity signal to a controller, the device comprising:
connector J1;
a digital quantity input circuit;
the input end of the circuit is connected with the connector J1, and the output end of the circuit is connected with the controller.
The specific structure of the digital quantity input circuit refers to the above embodiments, and since the present embodiment adopts all technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not described in detail herein.
It should be noted that the above-mentioned serial numbers of the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments. The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A digital quantity input circuit having an input terminal connected to a connector J1 and an output terminal connected to a controller U4, the circuit comprising:
the circuit comprises a triode T1, a triode T2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;
one end of the resistor R1 is connected with the connector J1, and the other end of the resistor R2 is connected with one end of the resistor R2 and the collector of the triode T2 respectively; the other end of the resistor R2 is respectively connected with the collector of the triode T1 and the base of the triode T2; the emitter of the triode T2 is respectively connected with the base of the triode T1 and one end of the resistor R3; the emitter of the triode T1 is respectively connected with the other end of the resistor R3, the resistor R4 and the controller U4;
the voltage output by the connector J1 reaches the base of the transistor T2 through the resistor R1 and the resistor R2, and the transistor T2 is turned on; the voltage across the resistor R1 reaches the collector of the transistor T2 and through the emitter of the transistor T2 to the resistor R3; the resistor R3 is used for limiting current, the voltage reaches the base electrode of the triode T1, when the voltage is larger than a preset threshold value, the triode T1 is conducted, and the triode T2 is turned off; the voltage passing through the resistor R2 reaches the collector of the transistor T1 and is output through the emitter of the transistor T1; the voltage output by the transistor T1 is divided by the resistor R4 and then input to the controller U4.
2. The digital quantity input circuit of claim 1, wherein the circuit further comprises:
a Light Emitting Diode (LED) 1 connected between an emitter of the transistor T2 and one end of the resistor R3;
the light emitting diode LED1 is used to indicate the operating status of the circuit.
3. The digital quantity input circuit as claimed in claim 2, wherein said circuit further comprises:
a diode D1 connected between the other end of the resistor R1 and the collector of the transistor T2;
the diode D1 is used to control the voltage direction or provide regulated protection to the LED 1.
4. The digital quantity input circuit of claim 1, wherein the circuit further comprises:
a diode array D2 connected between the emitter of the transistor T1 and the common junction of the resistor R4 and the controller U4;
the diode array D2 is used to provide electrostatic discharge protection to the circuit.
5. The digital quantity input circuit of claim 1, wherein the circuit further comprises:
a trigger inverter U1, a shift register U2 and a digital isolator U3 which are connected between the emitter of the triode T1 and the controller U4 and are connected in sequence;
the trigger inverter U1 is used for shaping the voltage output by the triode T1 and outputting a digital input signal;
the shift register U2 is used for converting one or more paths of received digital input signals and outputting synchronous serial signals;
the digital isolator U3 is used for isolating the circuit from the controller U4 and inputting the synchronous serial signal to the controller U4.
6. The digital quantity input circuit as claimed in claim 1, wherein the resistance value of the resistor R2 is larger than the resistance values of the resistor R1 and the resistor R4.
7. The digital quantity input circuit of claim 6, wherein the resistances of the resistor R1 and the resistor R4 range from greater than 0 Ω;
the resistance range of the resistor R2 is at least 100 times larger than that of the resistor R1, at least 100 times larger than that of the resistor R4 and larger than 100 omega.
8. The digital quantity input circuit as claimed in claim 1, wherein the preset threshold value is in a range of 0.5V to 0.7V.
9. The digital quantity input circuit as claimed in claim 1, wherein said controller U4 is a programmable logic controller.
10. A digital quantity input apparatus, characterized in that the apparatus comprises a digital quantity input circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123177836.3U CN216596001U (en) | 2021-12-16 | 2021-12-16 | Digital quantity input circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123177836.3U CN216596001U (en) | 2021-12-16 | 2021-12-16 | Digital quantity input circuit and device |
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| Publication Number | Publication Date |
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| CN216596001U true CN216596001U (en) | 2022-05-24 |
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| CN202123177836.3U Active CN216596001U (en) | 2021-12-16 | 2021-12-16 | Digital quantity input circuit and device |
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| CN (1) | CN216596001U (en) |
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2021
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